Title :
Is My UPS Distribution System Coordinated?
Author :
Cosse, Roy E., Jr. ; Dunn, Donald G. ; Spiewak, Robert M.
Author_Institution :
Powell Electr. Mfg. Co., Houston, TX
Abstract :
Typical petroleum and chemical industry UPS (uninterruptible power supply) distribution systems are reviewed for interrupting device selectivity during short-circuit conditions. When selectivity is not achieved, alternative solutions are proposed. Distribution system selectivity comparisons are performed for standard circuit breaker panelboards, fuse panelboards and custom panelboards utilizing hydraulic-magnetic circuit breakers. When remote panels are implemented, application considerations include oversizing feeder cables or using step-up/step-down transformers. To determine the "ride through" response of individual operating plant UPS loads, the voltage depression time during UPS distribution system fault clearing is compared with the load "ride through" capability. General guidelines are provided for improved UPS distribution system performance
Keywords :
circuit breakers; electric fuses; interrupters; power distribution faults; power distribution protection; uninterruptible power supplies; UPS distribution system fault clearing; chemical industry; circuit breaker panelboards; custom panelboards; distribution system selectivity; feeder cables; fuse panelboards; hydraulic-magnetic circuit breakers; interrupting device selectivity; petroleum industry; short-circuit conditions; step-down transformers; uninterruptible power supply; using step-up transformers; voltage depression time; Cables; Chemical industry; Circuit breakers; Circuit faults; Fuses; Guidelines; Petroleum; System performance; Transformers; Uninterruptible power systems; “hold-up” time; Alternate Source; ITI curve; Information Technology Equipment (ITE); Safety Interlock System (SIS); Selectivity; UPS; distributed control system (DCS); low-voltage (LV); molded case circuit breaker (MCCB); motor control center (MCC); programmable logic controller (PLC); pulse width modulated (PWM); time-current curve (TCC); true, online, double-conversion UPS;
Conference_Titel :
Pulp and Paper Industry Technical Conference, 2006. Conference Record of Annual
Conference_Location :
Appleton, WI
Print_ISBN :
1-4244-0281-6
DOI :
10.1109/PAPCON.2006.1673769
